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Standard XII
Physics
Charges on Conductors
Question

Assertion: In a cavity within a conductor, the electric field is zero.
Reason: Charges in a conductor reside only at its surface.
  1. If both assertion and reason are true but the reason is the correct explanation of assertion.
  2. If assertion is true but reason is false.
  3. If both assertion and reason are true but the reason is not the correct explanation of assertion.
  4. If both the assertion and reason are false.
  5. If reason is true but assertion is false.

A
If both assertion and reason are true but the reason is the correct explanation of assertion.
B
If both assertion and reason are true but the reason is not the correct explanation of assertion.
C
If reason is true but assertion is false.
D
If assertion is true but reason is false.
E
If both the assertion and reason are false.
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Solution
Verified by Toppr

Net field inside the conductor is zero because. by 'virtue of induced charges, applied and induced electric fields are equal and opposite thus the net charge resides on surface only. If any cavity is there inside the conductor, electric field will be zero in it.

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